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Cisco ONS 15454 SDH Procedure Guide, R7.0
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Chapter 6 Create Circuits and Low-Order Tunnels
NTP- D56 Create a Unidirectional Low-Order VC3 Circuit with Multiple Drops
Step 15 Click Next. In the VC LO Matrix Optimization page, choose one of the following:
• Create VC LO tunnel on transit nodes—This option is available if the VC3 circuit passes through a
node that does not have a low-order tunnel, or if an existing low-order tunnel is full. Low-order
tunnels allow VC3 circuits to pass through ONS 15454 SDHs without consuming low-order
cross-connect card resources. Creating low-order tunnels is a good idea if you are creating many
low-order circuits from the same source and destination. Refer to the Cisco ONS 15454 SDH
Reference Manual for more information.
• Create VC LO aggregation point—This option is available if you are creating a VC3 circuit to an
STM-N port for handoff to non-ONS 15454 SDH networks or equipment, such as an IOF, switch, or
DACS. A LAP allows low-order circuits to be routed through a node using one VC4 connection on
the cross-connect card high-order matrix rather than multiple connections on the low-order matrix.
If you want to aggregate the low-order circuit you are creating with others onto an VC4 for transport
outside the ONS 15454 SDH network, choose one of the following:
–
VC4 grooming node is source-node, VC12 grooming node is destination-node—Creates the
LAP on the VC3 circuit source node. This option is available only if the VC3 circuit originates
on an STM-N card.
–
VC4 grooming node is destination-node, VC12 grooming node is source-node—Creates the
LAP on the VC3 circuit destination node. This option is available only if the VC3 circuit
terminates on an STM-N card.
• None—Choose this option if you do not want to create a low-order tunnel or a LAP. This is the only
available option if CTC cannot create a low-order tunnel or LAP.
Step 16 Click Next. In the Route Review and Edit area, node icons appear so you can route the circuit manually.
The circuit source node is selected. Green arrows pointing from the source node to other network nodes
indicate spans that are available for routing the circuit.
Step 17 Complete the “DLP-D96 Provision a Low-Order VC3 Circuit Route” task on page 17-94 for the VC3
circuit you are creating.
Step 18 Click Finish. The Circuits window appears.
Step 19 In the Circuits window, click the circuit that you want to route to multiple drops. The Delete, Edit, and
Search buttons become active.
Step 20 Click Edit (or double-click the circuit row). The Edit Circuit window appears with the General tab
selected.
All nodes in the DCC network appear on the network. Circuit source and destination information appears
under the source and destination nodes. To see a detailed view of the circuit, click Show Detailed Map.
To rearrange a node icon, select the node, press Ctrl, then drag and drop the icon to the new location.
Step 21 In the Edit Circuit dialog box, click the Drops tab. A list of existing drops appears.
Step 22 Click Create.
Step 23 In the Define New Drop dialog box, create the new drop:
a. Node—Choose the target node for the circuit drop.
b. Slot—Choose the target card and slot.
c. Port, VC4, or VC3—Choose the Port, VC4, or VC3 from the Port, VC4, or VC3 drop-down lists.
The card selected in Step b determines the fields that appear. See Table 6-3 on page 6-4 for a list of
options.
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